You may also appreciate some Neo-Folk stuff, like :Of The Wand And The Moon: and (some) Sol Invictus. My girlfriend has just got into the former, so I've been hearing lots of them recently. Some lovely guitar work, again vaguely Kveldssanger-esque in places.

And though it's only one brief track, the intro to Unleashed's "Where No Life Dwells" is a lovely classical guitar piece, well worth hearing.

What about Crimson Towers, Into Infinite Obscurity and Feathers Fell from Dissection (Swe)'s The Somberlain? Maybe not that folky but they are really nice classical-based songs. On the more folkish side there is Visor om Slutet by Finntroll, possibly you can find something you like there.